Modulated Structure of an Ising Spin System on a Triangular Lattice. II. Completa Devil's Staircase

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概要

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• A study is made on an !sing spin system on a triangular (actually hexagonal)lattice which contains the couplings of the nearest neighbor (.Z.) and the next-nearest neighbor (.Z.<0: antiferromagnetic). A mean field approximation isemployed. Infinite numbers of higher-order commensurate structures withone-dimensional modulation are shown to be stabilized at finite temperatures.Analytic calculations are performed at low temperatures to find that the modelexhibits a complete devil's staircase at J.>0 and ordinary staircases with in-finite steps at J.<0 and J. (2l.7'.l. It is shown that most of the phases stabilizedaround ./.=0 are partially disordered states. Numerical calculations are alsomade to construct a global phase diagram. The structure of the phase diagramis discussed in terms of domain boundary. In this context the order-disordertransition of (Nbj ,Ta.).C is compared with the theory.

• 社団法人日本物理学会の論文
• 1983-07-15

著者

• Nakanishi Kazuo

  Institute For Solid State Physics University Of Tokyo

関連論文

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• Modulated Structure of an Ising Spin System on a Triangular Lattice. II. Completa Devil's Staircase
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• Effects of Impurity Pinning on Commensurate Charge-Density-Wave State and Incommensurate-Commensurate Transition
• Theory of Discommensurations and Re-Entrant Lock-in Transition in the Charge-Density-Wave State of 2H-TaSe_2
• Impurity Effect on Temperature Dependence of Wave Number in Incommensurate Charge-Density-Wave State(Phase Transition・Charge Density Wave)
• Theory of Three-Dimensional Orderings of Charge-Density Waves in 1T-TaX_2(X:S,Se)
• Domain-like Incommensurate Charge-Density-Wave States and the First-Order Incommensurate-Commensurate Transitions in Layered Tantalum Dichalcogenides.II.2H-Polytype
• Domain-like Incommensurate Charge-Density-Wave States and the First-Order Incommensurate-Commensurate Transitions in Layered Tantalum Dichalcogenides. : I. 1T-Polytype

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